Here I am O Allah-azwj
عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنِ النَّضْرِ بْنِ سُوَيْدٍ عَنْ عَبْدِ اللَّهِ بْنِ سِنَانٍ قَالَ قَالَ أَبُو عَبْدِ اللَّهِ ( عليه السلام ) ذَكَرَ رَسُولُ اللَّهِ ( صلى الله عليه وآله ) الْحَجَّ فَكَتَبَ إِلَى مَنْ بَلَغَهُ كِتَابُهُ مِمَّنْ دَخَلَ فِي الْإِسْلَامِ أَنَّ رَسُولَ اللَّهِ ( صلى الله عليه وآله ) يُرِيدُ الْحَجَّ يُؤْذِنُهُمْ بِذَلِكَ لِيَحُجَّ مَنْ أَطَاقَ الْحَجَّ فَأَقْبَلَ النَّاسُ فَلَمَّا نَزَلَ الشَّجَرَةَ أَمَرَ النَّاسَ بِنَتْفِ الْإِبْطِ وَ حَلْقِ الْعَانَةِ وَ الْغُسْلِ وَ التَّجَرُّدِ فِي إِزَارٍ وَ رِدَاءٍ أَوْ إِزَارٍ وَ عِمَامَةٍ يَضَعُهَا عَلَى عَاتِقِهِ لِمَنْ لَمْ يَكُنْ لَهُ رِدَاءٌ
A number of our companions, from Ahmad Bin Muhammad, from Al Husayn Bin Saeed, from Al Naar Bin Suweyd, from Abdullah Bin Sinan who said,
Abu Abdullah-asws said: ‘The Hajj was mentioned to Rasool-Allah-saww, so he-saww to the ones to whom his-saww letter reached, from the ones who had entered into Al-Islam, that Rasool-Allah-saww intended the Hajj, proclaiming with that, the one who can bear the Hajj should perform the Hajj. So the people came over. So when he-saww encamped at Al-Shajara, he-saww ordered the people with the plucking of the armpit (hairs), and shaving the pubic (hair), and the bathing, and the stripping off their trousers and wearing of a cloak, or a loin cloth and a turban, placing it upon his shoulders for the one who does not happen to have a cloak for him.
وَ ذَكَرَ أَنَّهُ حَيْثُ لَبَّى قَالَ لَبَّيْكَ اللَّهُمَّ لَبَّيْكَ لَبَّيْكَ لَا شَرِيكَ لَكَ لَبَّيْكَ إِنَّ الْحَمْدَ وَ النِّعْمَةَ لَكَ وَ الْمُلْكَ لَا شَرِيكَ لَكَ وَ كَانَ رَسُولُ اللَّهِ ( صلى الله عليه وآله ) يُكْثِرُ مِنْ ذِي الْمَعَارِجِ وَ كَانَ يُلَبِّي كُلَّمَا لَقِيَ رَاكِباً أَوْ عَلَا أَكَمَةً أَوْ هَبَطَ وَادِياً وَ مِنْ آخِرِ اللَّيْلِ وَ فِي أَدْبَارِ الصَّلَوَاتِ
And he-asws mentioned that when he-saww exclaimed ‘لَبَّيْكَ اللَّهُمَّ لَبَّيْكَ ’ Talbiyya, said, ‘Here I-saww am O Allah-azwj! Here I-saww am! Here I-saww am! There is no associate for You-azwj! Here I-saww am! The Praise, and the Bounties are for You-azwj, and the Kingdom! There is no associate for You-azwj!’ And Rasool-Allah-saww would frequent in saying: ‘O the One with the Loftiness!’ And he-saww would exclaim Talbiyya every time he-saww met a rider, or ascend a high ground or go down a valley, and at the end of the night, and after the Prayers (an extract).[1]
[1] Al Kafi – V 4 – The Book of Hajj Ch 27 H 7